The main structure of the China Pavilion, "The Crown of the East," has a distinctive roof, made of traditional dougong or brackets, which date back more than 2,000 years. The dougong style features wooden brackets fixed layer upon layer between the top of a column and a crossbeam. This unique structural component of interlocking wooden brackets is one of the most important elements in traditional Chinese architecture. Dougong was widely used in the Spring and Autumn Period.